NOTE: As their name suggests hints are not exactly DJ Hero cheats, and are usually just simple (but very useful) tips on how you can unlock secret level, features, find hidden areas and such. Hopefully these will make playing DJ Hero even more entertaining.

Achievements
Complete each achievement to receive the allotted gamerscore.

200 Deep (15): Attain a 200 streak in any mix on hard difficulty or above using a DJ Hero^(TM) Turntable Controller.
360 Degrees (20): Perform a 360 degree rewind in any mix without missing any icons on hard or expert difficulty.
720 Degrees (35): Perform a 720 degree rewind in any mix without missing any icons on expert difficulty.
All Over the World (15): Complete a mix in every venue.
Bonus Bangers (35): Unlock all available bonus mixes from all setlists.
DJ Shadow Presents... (30): Earn 15 stars by playing any of the mixes in the DJ Shadow Presents setlist.
Double Trouble (10): Complete a 2 player one on one local game (DJ v DJ only).Euphoria DJ (15): Complete all the Perfect Regions and activate Euphoria in any mix on hard difficulty or above.
Euphoric Hoarder (20): Complete all the Perfect Regions in any mix on hard difficulty or above, without using Euphoria.
Fantastic Fader (20): Successfully perform all crossfades and crossfade spikes in any mix on hard difficulty or above.
Five in Ten (20): Earn 5 stars in any 10 mixes on medium difficulty or above.
Five in Twenty (35): Earn 5 Stars in any 20 mixes on medium difficulty or above.
Five Star (5): Earn 5 stars in any mix on expert difficulty.
Four in Twenty (25): Earn 4 Stars in any 20 mixes on medium difficulty or above.
Four Star (4): Earn 4 stars in any mix on hard difficulty.
Freestyle DJ (10): Trigger every Effects Zone and every Freestyle Sample Zone in any mix on hard difficulty or above.
Good Times (15): Earn 10 stars by playing any of the mixes in the Grandmaster Flash Presents setlist.
Graduation (10): Complete the tutorial Learn to DJ - Advanced Techniques.
Guitar and DJ (15): Play the Guitar DJ mode with one player as the DJ and the other as the Guitarist.
Harsh Fader (20): Successfully perform 5,000 crossfader moves.
Headliner (5): Host and complete an online game.
Hello World (5): Have your score posted to the online leaderboard.
Here Comes the Hot Starter! (25): Earn 50 Hot Starts in any complete mixes.
Legendary Status (80): Earn 5 stars in every mix on hard difficulty or above.
Master Blaster (20): Complete a setlist using the Ghetto Blaster deck.
Multiplier Madness (5): Achieve an 8X multiplier during any mix (not in the tutorial).
My 50 Pence (5): Attain a 50 streak in any mix on hard difficulty or above using a DJ Hero^(TM) Turntable Controller.
My First Set (5): Complete a setlist on any difficulty setting.
New Jack (1): Complete your first mix (not in the tutorial).
No Mistakes Allowed (20): Successfully perform all scratches in any mix on hard difficulty or above.
Props! (5): Watch the entire credits.
REEEWIINNNNDD!!! (15): Perform 4 rewinds without missing any icons in any mix on any difficulty.
Shout Out (5): Complete any mix using a microphone in a single player game.
Special Effects! (5): Turn the effects dial during every Effects Zone in any mix at any difficulty (not in the tutorial).
Spin Back King (20): Perform 20 rewinds.
Super Scratchin' (20): Successfully perform 10,000 scratches.
Superstar DJ (30): Get a 100% Hits in any mix on hard difficulty or above.
Supporting Act (5): Join and complete 3 online games.
Tap King (20): Successfully press the platter button(s) for all tap icons in any mix on hard difficulty or above.
The Choice Is Yours (15): Play an 8 mix custom setlist on medium difficulty or above and get at least 3 stars on all mixes.
The Full Set (30): Complete all mixes at any difficulty setting.
The Gift of Music (10): Unlock a bonus mix on any set list (where available).
The Grandmaster! (35): Earn 5 stars in every mix on medium difficulty or above.
The New Style (10): Construct and play all the mixes of a quicklist online with another player.
The Power of Two (15): Both players activate Euphoria and Star Power simultaneously in Guitar DJ Mode.
The Vinyl Cut (50): Earn 20 stars by playing any of the mixes in The Vinyl Cut setlist.
Tonight We DJ in Hell! (30): Attain a 300 streak in any mix on expert difficulty using a DJ Hero^(TM) Turntable Controller.
Turntable Perfection (100): Earn 5 stars in every mix on expert difficulty.
Walk-in Wardrobe (10): Complete any 10 mixes in 10 different outfits.
Win Online (25): Win 10 online games.